Writing Agent Skills
Independent PiSkill directory guide. The original skill remains hosted by Superpowers.
What is Writing Agent Skills?
Guides creation and testing of reusable Agent Skills using test-driven principles so a SKILL.md is validated against realistic agent behavior before deployment.
What does Writing Agent Skills do?
Writing Agent Skills is a Superpowers skill for creating reusable AI-agent skills with a test-driven mindset. It treats a skill as operational behavior that should be validated against realistic agent use, not merely as a Markdown document that looks convincing to a human reader.
Who is Writing Agent Skills best for?
- Developers creating SKILL.md files for coding agents
- Teams maintaining a reusable internal skill library
- Agent-platform builders testing skill behavior before rollout
- Users refining skills that agents currently follow inconsistently
Common use cases
- Create a new Agent Skill from a repeatable workflow
- Design test scenarios before finalizing skill instructions
- Improve an existing skill after observing agent failures
- Validate whether the skill triggers and guides behavior as intended
How does Writing Agent Skills work?
The workflow applies a red-green-refactor style process to skill authoring: define the failure or desired behavior, create scenarios that expose it, write the minimum instructions that change the behavior and then refine the skill without weakening the test evidence.
Key benefits
- Treats skill quality as observable behavior
- Helps prevent vague or decorative SKILL.md files
- Encourages realistic tests before rollout
- Supports iterative maintenance of an agent-skill library
Things to know
- Agent behavior can vary by model and environment
- A skill that passes one test set may fail on different tasks
- Skill instructions need maintenance as tools and agent capabilities change
Compatible tools
Frequently asked questions
How do you create a good AI Agent Skill?
Is writing a SKILL.md enough?
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